Making covered threads



Aug. 8, 19 4- A. ROSENSTEIIN ETAL MAKING COVERED THREADS 1 z m m t M 0, 5 m2 m 4 M s a V w m /M w W 5 T h o A Filed Sept. 10, 1942 Pa'tent'ed Aug. 8, 1944 Aaron Rosenstein,

Brookyln,

New York, and Harry Dolan, N. Y., assignors to Rosensteln Bros., New York, N. Y., a. firm Application September 10, 1942, Serial No. 457,843

3 Claims. (Cl. 18-8) This invention relates to the art of making covered elastic threads.

Heretofore, the winding of textile threads upo a core consisting of rubber or other elastic material for the purpose of providing a covered elastic thread, was a fairly complicated procedure requiring expensive machinery and considerable time.

An object of the present invention is to simplify this procedure and to provide a method of winding textile threads upon an elastic thread which does not require expensive installation and which is quick and simple.

Another. object is to improve the covering of elastic threads and other elongated objects through the use of extruded thread for this purpose.

A further object is to improve the structure of covered elastic threads and to simplify their manufacture by combining in the course thereof the extrusion of elastic threads with that of the covering.

Other objects of the present invention will become apparent in the course of the following specification.

In accomplishing the objects of the present invention it was found desirable to extrude continuously a non-elastic thread and to wind it continuously as it-is being extruded upon an elastic thread or other elongated object. The winding is accomplished by rotating the spinneret, the coagulating tank, the extrusion opening or nozzle, or the elastic thread. The formation of an elastic thread may take place at the same time as the covering thread is being extruded. Two or more rotary spinnerets or tanks may be used for winding difierent extruded threads upon an elastic core.

The invention will appear more clearly from the following detailed description whentaken in connection with the accompanying drawings showing, by way of example, preferred embodiments of the inventive idea.

In the drawings:

Figure 1 is a diagram. illustrating a process of extruding a thread and winding it upon a rubber thread;

Figure 2 is a section through a spinneret;

Figure 3 is a diagram illustrating the finished covered elastic thread;

Figure 4 illustrates diagrammatically a process combining two separate extrusions for the making of a covered elastic thread Figure 5 illustrates diagrammatically the maka spinneret.

ing of a rubber threadcarrying two oppositely wound extruded threads;

Figure 6 illustrates diagrammatically an elastic thread carrying two extruded threads wound in opposite directions.

Figure 7 illustrates diagrammatically an apparatus wherein a spinneret is rotated around an.

elastic thread.

Figure 8 illustrates diagrammat cally an apparatus wherein a spinneret carries out a planetary movement.

Figure 9 is a section along the line 9-9 of Figure 8.

Figure 10 is a diagram illustrating an apparatus wherein an elastic thread is rotated around Figure 11 is a top view of the apparatus shown in Figure 10. A

Figure 12 is a diagram illustrating a viscose spinning operation combined with the winding operation.

The process illustrated in Figure 1 of the drawings includes the manufacture of rayon from wood pulp or other supply of cellulose by the viscose method or any other suitable method known in the art. i

The cellulose mixture after having been properly aged in an accustomed manner, is forced by a suitable pump I II from a pipe I I and through a pipe I2 and into the usual candle filter I3. Thence the mixture flows through a pipe or glass tube I4 and into a hollow stationary ring 21 which surrounds a rotary tank Il. The tank I! carries a nozzle or spinneret I5 usually formed of noble metals, glass or the like. The nozzle I5 is in communication with the interior of the ring 21 and is provided with one or more orifices through which the cellulose mixture or viscose is forced into a coagulating bath IE situated in the tank I'I. Obviously, the nozzle I5 is rotated along with the tank I I while remaining in communication with the interior of the ring 21. The coagulating bath is prepared in the usual manner and may contain sulphuric acid and other sulphate or sulphite salts. The cellulose mixture leaves the bath I6 in the form of a thread l8 through a narrow opening provided in a bottom portion I9 of the tank I I.

The tank I! and the nozzle I5 carried by the tank are rotated by any suitable means, such as a pulley 20 and an endless belt 2|. A tube 23 which.

extends through the center of the tank may be carried by the bottom portion I9.

An elastic thread 24 is drawn through the tube 23 by any suitable means not shown in the drawwith a nut 38. A packing ings. The elastic thread 24 passes between rollers 25 as it is being unwound from a spool 25.

The extruded thread I8 is pulled against the elastic itself spirally around the elastic thread 24 due to the rotation of the tank portion I9 and the feed movement of the elastic thread 24. Thus a covered elastic thread is produced, which is shown in Figure 3 and which comprises an elastic core 24 and an extruded covering I8 wound upon the core 24.

Obviously, rayon thread I8 may be substituted by any suitable extruded thread.

Figure 2 shows a device which may be used when a thread I8 is extruded directly into the open through an extrusion opening3ll of a bottom portion 3| of a spinneret 32. A suitable solution 33 of any soup of proper viscosity is introduced in the usual manner into the spinneret 32 through a pipe 34 which is attached to the upper immovable portion 35 of the spinneret. The portion 35 is attached to supporting plates 33 and carries a threaded flange 3! which meshes 39 is situated between the flange 31 and the nut 38 and is in engagement with a rotary tube 40 which extends through the spinneret and which may be integral with the rotary bottom portion 3| of the spinneret.

The rotary portion 3I may be conveniently designated as the spinneret, while the immovable portion 35 may be designated as the tank.

The spinneret portion 3| is firmly connected with a pulley 4| which is driven by an endless belt 42. The portion 3| is held in place by the engagement of a flange 43 of the portion 3| with a nut 44 which is screwed upon a threaded flange 45 of the portion 35. A packing 46 is situated between the flanges 43 and 45.

In operation, a suitable solution 33 is supplied to the spinneret 32 through the pipe 34, and a thread I8 is extruded through the opening 30 of the spinneret portion 3|. A rotation of the endless belt 42 passing over the pulley 4| will rotate the spinneret portion 3|. At the same time, an elastic thread 24 is drawn through the tube 40. Since the opening 38 rotates around the elastic thread 24, the extruded thread I8 may be conveniently wound upon the elastic thread to form the covered elastic thread illustrated in Figure 3.

Any suitable elastic thread 24 may be used for the purpose of the present invention; it may consist of rubber, balata, gutta-percha, synthetic rubber and other extensible and elastic materials. The manufacture of the elastic thread may constitute an integral part of the described method, as indicated in Figures 4 and 5.

Figure 4 shows a container 50 which is suspended from a supporting plate and which may be filledwith liquid rubber latex 52 through a pipe 53.

Obviously, rubber latex of the common Hevea variety may be substituted by any analogous dispersions of rubber, synthetic rubber and similar materials in a vulcanized or unvulcanized condition. The dispersions may be concentrated, thinned, stabilized or otherwise preliminarily treated and may contain any desirable compounding and conditioning agents.

The container 50 is preferably steam heated by any suitable means (not shown). A rubber thread 24 is extruded through an opening 54 provided in the bottom of the container 5Il. This rubber thread may be washed and dried, whereupon it is taken to a vulcanizer and properly thread 24 in such manner that it will wind.

thread I8 which is extruded through the opening 30 of the spinneret 32 iswound upon the rubber thread in the previously described manner.

An important advantage of this process is that since a freshly extruded rubber thread retains some of its adhesiveness, it is permanentlyand firmly connected, with its covering constituted by the extruded thread I8.

Figure 5 illustrates a process of making a covered elastic thread shown in Figure 6 and comprising an extruded thread 50 which is wound in the opposite direction to that of the extruded thread l8'carried by the elastic core 24.

The elastic thread 24 is extruded through the container 50 and is passed through the tube 48 of the spinneret 32, whereupon a thread I8 extruded through the spinneret 32 is wound upon the elastic thread 24. The bottom portion 3| 0! the'spinneret 32 is rotated by the belt 42 and the pulley 4| in the direction of the arrow 6|. Since the freshly extruded rubber thread 24 is still adhesive, while the freshly extruded thread I8 is somewhat plastic, a very permanent and firm connection is provided between the elastic core 24 and the covering I8.

The covered thread is passed immediately thereafter through a tube I40 of another spinneret I32, which is similar to the spinneret 32 and the bottom portion I3I of which is rotated by a belt I42 and a pulley MI in the direction of the arrow 62 which is opposed to the direction of rotation of the belt 42 and the pulley 4|. Thus the thread 8|] extruded through the spinneret I32 is wound upon the covered elastic thread emerging out of the tube I40 in a direction opposite to that in which the thread l8 was Wound.

Figure '1 illustrates an apparatus wherein a spinneret 'II] is rotated about an elastic thread 24 in order to wind a plurality of extruded threads I8 upon the thread 24. The spinneret I8 is connected by an arm II with a toothed ring 12 which is mounted upon a stationary supporting ring I3 and which meshes with a pinion I4. A so-called soup is supplied to the spinneret 10 through a stationary pipe I5 which is mounted in the rin I3 and which is in communication with a tubular member I8 constituting a part of the rotary spinneret. The soup is extruded through the openings 30 of the spinneret in the form of threads I8. The elastic thread 24 extends through a central opening provided in the supporting ring 13. The spinneret I0 is rotated around the elastic thread 24 by the pinion I4 which transmits its rotation to the toothed ring 12 carrying the spinneret ID by means of the arm II. Thus the extruded threads I8 are wound upon the elastic thread I8.

In the construction shown in Figures 8 and 9, a spinneret 88 rotated about an elastic thread 24 is provided with a rotary bottom portion which is suspended from an upper portion 8| by an annular nut carried by the flange 82 of the portion 8| and supporting a flange 83 of the rotary portion 80. The portion 80 carries a gear wheel 84 which meshes with a stationary gear crown 85 carried upon a tube 81. The tube 81 is mounted I in the supporting ring I3 and contains the elastic As in the previously described construction, a soup is supplied to the spinneret 88 through the stationary pipe I and a pipe 16 rotating along with the spinneret. The spinneret is rotated around the elastic thread 24 by the pinion I4 which meshes with the toothed ring 12. At the same time, the bottom portion 80 is rotated around its axis by the engagement of the gear wheel 84 with the gear crown 86. carries out a planetary movement about the elastic thread 24. The thread I8 extruded through a central opening 30 of the spinneret is somewhat twisted as it is being wound upon the elastic thread 24, due to this planetary motion of the spinneret portion 80.

Figures and 11 illustrate an apparatus wherein the elastic thread 24 is rotated around a spinneret 98 which is stationary. The soup is introduced through a pipe 9| and the thread I8 is extruded through a bottom opening 30. The

elastic thread 24 extends through openings provided in two rotary arms 92 and 93 Joined by a rod 94. The arm 92 is firmly connected with a gear wheel 95 meshing with a pinion 9B. The arm 93 extends around the spinneret and is supported by an annular flange 81 which is firmly connected with the spinneret.

The thread or similar elongated element 24 is rotated about the spinneret 98 by a pinion 96 which rotates the wheel 85 connected to the arm 92. At the same time, a thread It is extruded through the opening 39, so that it is wound upon the thread or element 28.

Figure 12 illustrates an apparatus for carrying out a viscose spinning operation. The viscose solution fiows through a filter I08 and a pipe liii into a spinneret I02 having a stationary portion Hi3 anda rotary portion I04 which is supported by an annular nut I05 carried by a flange I05 of the portion I83 and carrying a flange I 01 of the portion I04. The spinneret portion I04 is rotated by a pulley I08 and a belt I09. The portion I84 carries a tube IIO for an elastic thread 24 and is immersed in a coagulating bath III contained in a tank II2. The extruded thread I8 is wound upon the elastic thread 24 and the two threads are passed over guides H3 and H4 and over a godet or revolving draw-wheel II 8. Thence the covered elastic thread passes through a funnel guide II8 and into the usual centrifugal pot or spinning box Hi.

It is apparent that the specific illustrations shown above have been given by way of illustration and not by way of limitation and that the Thus the spinneret portion 80 iii methods and apparatus above described are sub- Ject to wide variation and modification without departing from the scope or intent of the present invention. All of such variations and modiflcations are to be included within the scope of the present invention.

What is claimed is: I

1. The method of producing an elastic yarn having an inelastic cover which comprises continuously extruding a non-elastic cover thread from 'a solution, moving an elastic core thread in the general direction of its length and in a path past the extrusion point of the non-elastic thread in which it is maintained out of contact with the solution, and moving the freshly extruded non-elastic thread at a point adjacent its point of extrusion in a path of revolution about the elastic core thread to wind it continuously in a plastic state as it is being extruded directly upon the surface of the elastic core thread.

2. The method of producing an elastic yarn having an inelastic cover which comprises the steps of continuously extruding an elastic core thread from a solution, substantially simultaneously extruding a non-elastic thread from a solution, moving the elastic thread as extruded in the general direction of its length and in a path past the extrusion point of the non-elastic thread, and moving the non-elastic thread while in a plastic and sticky state in a path of revolution about the elastic thread while the latter is still in a sticky state to wind the non-elastic thread about the elastic thread and to cause their adherence together.

3. An apparatus for producing an elastic yarn having an inelastic cover, said apparatus comprising, in combination, means having an extrusion opening for continuously extruding an elastic core thread from a solution, other means having an extrusion opening for substantially simultaneously continuously extruding a nonelastic thread from a solution, means for continuously moving the elastic thread as extruded in the general direction of its length and in a path past the extrusion point of the non-elastic thread, and means continuously moving the nonelastic thread while in a plastic and sticky state in a path of revolution about the elastic thread while the latter is still in a sticky state to wind the non-elastic thread about the elastic thread and to cause their adherence together.

AARON ROSENSTEIN. HARRY DOLAN. 

